Abstract Specification in Object-Z and CSP

  • Graeme Smith
  • John Derrick
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2495)


A number of integrations of the state-based specification language Object-Z and the process algebra CSP have been proposed in recent years. In developing such integrations, a number of semantic decisions have to be made. In particular, what happens when an operation’s precondition is not satisfied? Is the operation blocked, i.e., prevented from occurring, or can it occur with an undefined result? Also, are outputs from operations angelic, satisfying the environment’s constraints on them, or are they demonic and not influenced by the environment at all? In this paper we discuss the differences between the models, and show that by adopting a blocking model of preconditions together with an angelic model of outputs one can specify systems at higher levels of abstraction.


Formal Method Concurrent System Incoming Message Exceptional Behaviour Simulation Rule 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2002

Authors and Affiliations

  • Graeme Smith
    • 1
  • John Derrick
    • 2
  1. 1.Software Verification Research CentreUniversity of QueenslandAustralia
  2. 2.Computing LaboratoryUniversity of KentCanterburyUK

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